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Most paleontologists now agree that an asteroid did hit the Earth at approximately the end of the Cretaceous, but there is an ongoing dispute whether the impact was the sole cause of the extinctions. There is evidence that there was an interval of about 7012946728000000000â 300 ka from the impact to the mass extinction.
1 Flowering plants began to appear late in the period. 2  The Jurassic period also ended with an extinction, but it was not as extensive as the one in the Triassic period. 3  Only a few types of dinosaurs died out.